#course {
  position: relative;
}
#course .context {
  position: relative;
}
#course .left {
  position: absolute;
  top: -20px;
  background-color: #fff;
  width: 180px;
  height: calc(100vh - 96px);
  text-align: center;
}
#course .left .header {
  width: 100%;
  height: 200px;
}
#course .left .header img {
  margin-top: 30px;
  width: 138px;
  height: 78px;
  border-radius: 6px;
}
#course .left .header p {
  font-size: 16px;
  line-height: 21px;
  margin-top: 10px;
}
#course .left .selected {
  background-color: #f4f5f5;
  color: #3B90FF;
}
#course .left>div:nth-child(n+2) {
  height: 56px;
  line-height: 56px;
  text-align: left;
}
#course .left>div:nth-child(n+2) span {
  padding: 0 10px 0 47px;
  vertical-align: -0.28em;
}
#course .left>div:nth-child(n+2) span svg {
  width: 18px;
  height: 18px;
}

#course .right {
  margin-left: 200px;
  width: calc(100% - 220px);
  border-radius: 8px;
  height: calc(100vh - 116px);
  background-color: #fff;
}